I dont get it. If u dont like it just dont play it.
In my oppinion it is the best thing. I only Mythic Raid to get my Gear pieces to let me push M+ even further not the other way round.
Usually i loose interest in an addon after like around 1 Year or 2 Raid Tiers and i quit to the next expansion. This time is the first time i am still into it and even more then ever looking forward to the upcoming Push Weeks with BIS Corruptions.
Ofc the M+ System has some flaws. Fort/Tyr should be removed or better balanced, Season 1 and 3 Affix were shitty, the overall balance between certain Affix combo weeks should be better and in higher keys the META Issues(at least that got a little better in S4)
Maybe it is on purpose but there are some weeks where u almost only do your weekly key and thats it and other weeks where everyone is grinding 24/7. Just balance the shit combo weeks a little bit maybe? I dont say all weeks should be equal but at the moment Tyrannical and some weeks are just overtuned.
And with the Meta Issue someone in a different post suggested some kind of NPC at the start where u could get 1-2 special Group abilities like an additional stun or Shroud, anything which lets u take classes with a little less utility or dont be forced to take some classes.
A lot of people complain about the complexity of the Trash and the Esports design. In keys below 15 all that really doesnt matter the casts dont hurt and u can just run through the dungeon without careing much about any ability. If u wanna push higher sure u need to know and handle the trash mechanics and thats fine, maybe higher keys isnt just for those people.